Idk what's happening with me anymore

There are some times when I'm writing something and instead of putting the word that I'm supposed to put I put a different one, for example im supposed to write word but I wrote coffee something like that despite of me thinking of that certain words and this have been happening repeatedly, this has never happened to me before and I'm honestly kinda worry. There are also times where I'm constantly misspelling words despite me knowing the spelling of it, it's been happening alot to the point that I have To reread what I wrote for 3 times just to check if the red any arrores and sometimes when I'm writing or typing my heads gets all foggy in way that I cang explain